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G. Tisserant, Z. Fattah, C. Ayela, J. Roche, B. Plano, D. Zigah, B. Goudeau, A. Kuhn and L. Bouffier. 

Electrochim. Acta, 2015, 179, 276-281.

Bipolar electrochemistry is an unconventional technique that currently encounters a renewal of interest due to modern applications in the fields of analytical chemistry or materials science. The approach is particularly relevant for the preparation of asymmetric objects or surfaces such as Janus particles for example. Bipolar electrochemistry allows spatially controlled deposition of various layers from electroactive precursors, selectively at one side of a bipolar electrode. We report here the concomitant cathodic deposition of up to three different metals at the same time in a single experiment. The deposits were characterized by optical and electron microscopy imaging as well as profilometry and energy dispersive X-ray spectroscopy. As a result, the deposited layer is composed of several areas exhibiting both a composition and a thickness gradient. Such a variation directly modifies the optical and electronic properties alongside the surface and gives access to the design of composite surfaces exhibiting a visual gradient feature.

2015-4

Redox- and pH-Responsive Nanogels Based on Thiolated Poly(aspartic acid)
lundi 25 juillet 2016
Enikő Krisch, Léa Messager, Benjámin Gyarmati, Valérie Ravaine, and András Szilágyi Macromol. Mater. Eng. 2016, 301(3), 260–266 Nanogels loaded with fluorescent dextran as a model drug are synthesized by the oxidation induced cross-linking of water soluble redox responsive thiolated poly(amino acid) in miniemulsion without the introduction of any cross-linker molecule. Two types of high... Read More...
Wall slip across the jamming transition of soft thermoresponsive particles
lundi 25 juillet 2016
Thibaut Divoux, Véronique Lapeyre, Valérie Ravaine, and Sébastien Manneville Phys. Rev. E 2015, 92, 060301(R) Flows of suspensions are often affected by wall slip, that is, the fluid velocity Vf in the vicinity of a boundary differs from the wall velocity Vw due to the presence of a lubrication layer. While the slip velocity Vs = abs (Vf - Vw) robustly scales linearly with the stress S at the... Read More...
Differential Photoluminescent and Electrochemiluminescent Behavior for Resonance Energy Transfer Processes in Thermoresponsive Microgels
lundi 25 juillet 2016
Florent Pinaud, Romain Millereux, Pierre Vialar-Trarieux, Bogdan Catargi, Sandra Pinet, Isabelle Gosse, Neso Sojic, Valérie Ravaine J. Phys. Chem. B, 2015, 119 (40), pp 12954–12961 Stimuli-responsive microgels with redox and luminescent resonance energy transfer (LRET) properties are reported. Poly(N-isopropylacrylamide) microgels are functionalized simultaneously with two models dyes: a... Read More...
One-Step Preparation of Bifunctionalized Surfaces by Bipolar Electrografting
mercredi 30 décembre 2015
L. Koefoed, K. Shimizu, S. U. Pedersen, K. Daasbjerg, A. Kuhn, and D. Zigah RSC Adv., 2015, DOI: 10.1039/c5ra20156j Bipolar electrochemistry (BPE) is widely used to trigger electrochemical reactions on conducting objects without direct electrical wiring. In this study a novel methodology is reported, which for the first allows simultaneous deposition of two different organic films at each end of... Read More...
Original Dual Microelectrode: Writing and Reading a local click reaction with Scanning Electrochemical Microscopy
jeudi 5 novembre 2015
V. Badets, D. Duclos, D. Quinton, O. Fontaine, D. Zigah Electrochimica Acta, 2015, doi:10.1016/j.electacta.2015.10.066 A dual gold-copper microelectrode (diameter 25 μm) was fabricated to be employed in a scanning electrochemical microscopy (SECM) configuration, and was used in feedback mode to both modify (write) and analyze (read) a substrate. This write-and-read procedure was performed... Read More...
Electrogenerated Chemiluminescence of Cationic Triangulene Dyes: Crucial Influence of the Core Heteroatoms
jeudi 5 novembre 2015
C. Adam, A. Wallabregue, H. Li, J. Gouin, R. Vanel, S. Grass, J. Bosson, L. Bouffier, J. Lacour and N. Sojic. Chem. Eur. J., 2015, 21, 19243-19249. Trianguleniums are fascinating conjugated hexacyclic cations that exhibit interesting electronic and optical properties. Herein, the electrogenerated chemiluminescence (ECL) emission of this family of fluorescent dyes is reported for the first time.... Read More...
Solid-State Bipolar Electrochemistry: Polymer-Based Light-Emitting Electrochemical Cells
jeudi 5 novembre 2015
S. Chen, G. Wantz, L. Bouffier and J. Gao. ChemElectroChem, 2016, 3, 392-398. We present solid-state, polymer-based, light-emitting electrochemical cells incorporating bipolar electrodes (BPEs) positioned between the driving electrodes. The dominant processes in these planar electrochemical cells are in situ electrochemical p and n doping of the luminescent conjugated polymer when a sufficient... Read More...
Guiding pancreatic beta-Cells to target Electrodes in a whole-cell Biosensor for Diabetes
vendredi 25 septembre 2015
E. Pedraza, A. Karajić, M. Raoux, R. Perrier, A. Pirog, F. Lebreton, S. Arbault, J. Gaitan, S. Renaud, A. Kuhn, J. Lang Lab Chip, 2015, 15, 3880–3890 We are developing a cell-based bioelectronic glucose sensor that exploits the multi-parametric sensingability of pancreatic islet cells for the treatment of diabetes. These cells sense changes in the concentrationof glucose and physiological... Read More...
The EChemPen: A Guiding Hand To Learn Electrochemical Surface Modifications
mercredi 23 septembre 2015
M. Valetaud, G. Loget, J. Roche, N. Hüsken, Z. Fattah, V. Badets, O. Fontaine, D. Zigah. J. Chem. Educ., 2015, 92 (10), pp 1700–1704. The Electrochemical Pen (EChemPen) was developed as an attractive tool for learning electrochemistry. The fabrication, principle, and operation of the EChemPen are simple and can be easily performed by students in practical classes. It is based on a regular... Read More...
Bipolar Electrografting on the Inner Wall of Carbon Nanotubes
mercredi 23 septembre 2015
C. Kumsapaya, J. Limtrakul, A. Kuhn, D. Zigah, C. Warakulwit. ChemElectroChem, 2016, 3, 410-414. Vertically aligned carbon nanotubes were grown over the inner wall of the pores of an anodic aluminum oxide template via chemical vapor deposition. The versatile approach of bipolar electrochemistry was generalized to modify the tubes selectively on one end with an organic layer of 4-aminobenzene... Read More...
Single-Step Screening of the Potential Dependence of Metal Layer Morphologies Along Bipolar Electrodes
lundi 7 septembre 2015
G. Tisserant, J. Gillion, J. Lannelongue, Z. Fattah, P. Garrigue, J. Roche, D. Zigah, B. Goudeau, A. Kuhn and L. Bouffier.  ChemElectroChem, 2016, 3, 387-391. The preparation of surface gradients is a very hot topic in contemporary research. Among various physical chemistry approaches, bipolar electrochemistry allows the control of such gradients through the interfacial polarization between... Read More...
Enantioselective Recognition of DOPA by mesoporous Platinum imprinted with Mandelic acid
vendredi 24 juillet 2015
T. Yutthalekha, C. Warakulwit, J. Limtrakul, A. Kuhn Electroanalysis, 2015, Special Issue Advanced Materials, in press Chiral imprinted mesoporous platinum was electrochemically synthesized in the presence of mandelic acid and Brij 56 surfactant as chiral and mesoporous templates, respectively. The chiral cavity obtained by using mandelic acid as template can be used to distinguish between... Read More...
Bottom-up Generation of Miniaturized Coaxial Double Electrodes with tunable Porosity
vendredi 24 juillet 2015
A. Karajić, S. Reculusa, M. Heim, P. Garrigue, S. Ravaine, N. Mano, A. Kuhn Adv. Mater. Interfaces, 2015, in press We report the bottom-up design of a fully integrated and miniaturized electrochemical cell consisting of two independently addressable macroporous electrodes with well-defined porosity, controllable thickness and easily tunable spacing. The concept is based on the electrodeposition... Read More...
3D electrogenerated chemiluminescence: from surface-confined reactions to bulk emission
jeudi 11 juin 2015
M. Sentic, S. Arbault, L. Bouffier, D. Manojlovic, A. Kuhn and N. Sojic.   Chem. Sci., 2015, 6, 4433-4437.   Among luminescence techniques, electrogenerated chemiluminescence (ECL) provides a unique level of manipulation of the luminescent process by controlling the electrochemical trigger. Despite its attractiveness, ECL is by essence a 2D process where light emission is strictly... Read More...
Synthesis of conducting asymmetric hydrogel particles showing autonomous motion
jeudi 28 mai 2015
A. Srinivasan, J. Roche, V. Ravaine and A. KuhnSoft Matter, 2015, 11, 3958-3962 In the present work, we introduce a new approach for the synthesis of asymmetric particles made from electrically conducting polyaniline-alginate hydrogels by using bipolar electrochemistry. Such an intrinsic break of symmetry allows the soft beads to exhibit tunable motion at the air/water interface when loaded with... Read More...
Shearforce Positioning of Nanoprobe Electrode Arrays for Scanning Electrochemical Microscopy Experiments
mardi 12 mai 2015
C. Adam, F. Kanoufi, N. Sojic and M. Etienne. Electrochim. Acta, 2015, in press. Shearforce detection was applied to the controlled positioning of nanotip arrays at air/solid and liquid/solid interfaces in scanning electrochemical microscopy (SECM). The arrays were fabricated by wet chemical etching of ordered optical fiber bundles. The shearforce detection have been performed with a non-optical... Read More...
Generation of Metal Composition Gradients by Means of Bipolar Electrodeposition
mercredi 18 mars 2015
G. Tisserant, Z. Fattah, C. Ayela, J. Roche, B. Plano, D. Zigah, B. Goudeau, A. Kuhn and L. Bouffier.  Electrochim. Acta, 2015, 179, 276-281. Bipolar electrochemistry is an unconventional technique that currently encounters a renewal of interest due to modern applications in the fields of analytical chemistry or materials science. The approach is particularly relevant for the preparation of...
Effects of 50 Hz Magnetic Fields on Gap Junctional Intercellular Communication in NIH3T3 Cells
mercredi 18 février 2015
Y. Percherancier, B. Goudeau, R. Charlet de Sauvage, F. Poulletier de Gannes, E. Haro, A. Hurtier, N. Sojic, I. Lagroye, S. Arbault, and B. Veyret Bioelectromagnetics, 2015, 36, 4, 287-293. The present study focused on gap junctional intercellular communication (GJIC) as a target for biological effects of extremely low-frequency (ELF) magnetic field (MF) exposure. Fluorescence recovery... Read More...
Synthesis of Multivalent Silica Nanoparticles combining both Enthalpic and Entropic Patchiness
vendredi 16 janvier 2015
C. Hubert, C. Chomette, A. Désert, M. Sun, M. Treguer, S. Mornet, A. Perro, E. Duguet, S. Ravaine Faraday Discuss., 2015, 181, 139-146 Silica particles with a controlled number of entropic patches, i.e. dimples, are synthesized through the growth of the silica core of binary multipods that have been produced by a seeded-growth emulsion polymerization reaction. Transmission electron microscopy... Read More...
Linking Glucose Oxidation to Luminol-based Electrochemiluminescence using bipolar Electrochemistry
mercredi 10 décembre 2014
V. Eßmann, D. Jambrec, A. Kuhn, W. Schuhmann Electrochem. Comm. 2015, 50, 77–80. The range of potential analytes for bipolar electrochemistry can be significantly extended by modification of bipolar electrodes with enzymatic biosensing layers. In this study, we employed a Prussian blue-based glucose detection system involving electrochemical reduction of enzymatically generated hydrogen... Read More...